[ « 3 * ] 
Terankus. See Nardus Indie a* 
Theorem. In any fpherical triangle, if two of the fiJea, and the fum of the oppofite 
angles are given, it will be, as the tangent of half the fum of the fules is to the 
tangent of half their difference, fo is the tangent of half the fum of the angles to 
the tangent of half their difference, p. 199. General theorem, p. 238. 
Tin, calcined by a mixture of "itiio'iic and nitrous acids in a concentrated Hate, 
p. 373* 
Triangles, calculation of a feries of, extending from Windfor to Dunkirk, whereby the 
geodeticaj diftance between the meridians of the Royal Obfervatories of Greenwich 
and Paris is determined, p. 168. Excefs of the angles of fpherical above thofe of 
plane triangles, ib. Secondary triangles, fubdivided into two fets, for the improve* 
ment of the maps of the country, and the plan of London and its environs, 
p. 247. 
Turkey, Tabafheer much ufed in, p. 274. See Talajheer • 
V. 
Vedroo Carpooram (bamboo camphor), p. 274. See Tabajhcer . 
Vcdroo-paloo ^bamboo -nnik), p« 274* See Iahafl.ee >» 
Venus. Obfervations on the heliocentric longitude and the annual motion of Venus’s 
nodes, p, 21. Ohfervations on the greatell inclination of the orbit of Venus to the 
ecliptic, p. 26. See Tables. 
Vinegar deftroys the fetid odour of animal hepatic air, p. 423. 
Volatile alkali, putrid fubftances frequently abound with, p. 398. 
\V. 
» M * 
Wardrobe tower of Windfor Caftle, its latitude, longitude, &c. p. 232. 
Watchet Hill , its longitude weft of Greenwich determined, p. 390. Its latitude deter- 
mined, ib. 
Wedgwood, Jofiah, Efq. on the analyfts of a mineral fubftance from New South Vales, 
p. 306, 
Wildbore , Rev. Charles, on fpherical motion, p. 496. 
Windfor Caftle, latitude, longitude, &c. of the wardrobe tower of, p.232. 
Wine, fpirit of, gives a phlogifticated quality to nitrous acid, p.362. 
Withering, Dr. on fome extraordinary effe&s of lightning, p. 293. 
Wollaflon , F. J. H. on a luminous arch, p. 43. 
Wrotham Hill , its latitude, longitude, &c. p. 232. 
